Can you give us the measurements? It does not look like a Civil War Colt from what I have seen but I am nowhere near being an expert. We do have an arms expert who comes here. It was apparently excavated somewhere. It may have been from a battlefield somewhere or someone trying to hide a weapon from a crime. Guns were rarely lost or tossed out for lack of use. I saw a show where a western gun was stashed in a small cave and someone found it. It was in the same condition as that one. It turned out to be from the 1880s.